HIRSCHMANN MM20-M2M2M2M2SAHH Ethernet media module
HIRSCHMANN MM20-M2M2M2M2SAHH (order configurator code: MM20-M2M2M2M2SAHH…) is a hot-swappable,
4-port Fast Ethernet Media Module designed for Hirschmann’s modular MICE (Modular Industrial Communication Equipment) Switch family (MS20 and MS30 series).
Featuring 4 fixed Multimode SC fiber optic ports (100Base-FX), this module provides high-density optical connections over short-to-medium distances ($100\text{BASE-FX}$ up to $5\text{ km}$ over $50/125\,\mu\text{m}$ fiber), offering complete immunity to electromagnetic interference in harsh factory automation environments.
Product Overview
Hirschmann MM20-M2M2M2M2SAHH is a 4-port Fast Ethernet SC multimode fiber media module engineered for localized optical backbones within MS20/30 modular switches. Designed for standard industrial environments, it provides reliable point-to-point fiber connectivity with dynamic hot-swappable backplane integration, eliminating ground loops and noise susceptibility across automated industrial networks.
Technical Table
| Parameter | Specification |
| Product Type | Fast Ethernet MICE Multimode Fiber Media Module |
| Model Code | MM20-M2M2M2M2SAHH |
| Port Configuration | 4 x 100Base-FX Multimode Optical Ports |
| Connector Type | Duplex SC Connectors |
| Wavelength | $1300\text{ nm}$ |
| Fiber Core Size / Range | $50/125\,\mu\text{m}$ (up to $5\text{ km}$) / $62.5/125\,\mu\text{m}$ (up to $4\text{ km}$) |
| Power Supply | Powered directly via MS20/MS30 switch backplane |
| Power Consumption | $\approx$ 6W to 8W |
| Enclosure Rating | IP20 (Industrial Housing) |
| Dimensions (W x H x D) | $38 \times 134 \times 118\text{ mm}$ |
| Hot-Swappable | Yes (Dynamic backplane insertion/removal) |
| Diagnostic Indicators | LEDs for Power, Link Status, Data Traffic, and Duplex |
| Certifications | cUL 508, ISA 12.12.01 Class 1 Div 2, CE, EN 61000-4 series |
Environmental Tolerance Conditions
Operating Temperature Range: $0^\circ\text{C}$ to $+60^\circ\text{C}$ (Standard industrial rating).
Storage Temperature Range: $-40^\circ\text{C}$ to $+70^\circ\text{C}$.
Relative Humidity: 10% to 95% (Non-condensing).
Vibration & Shock Resistance: Tested to IEC 60068 standards (up to 15g shock duration at 11 ms).
EMC Immunity: Certified to EN 61000-4-2 (ESD), EN 61000-4-4 (Burst), and EN 61000-4-5 (Surge) for heavy industrial environments.
Operating Instructions
ESD Safety Prep: Put on an anti-static wrist strap connected to cabinet ground before unboxing or touching the circuit board.
Backplane Insertion:
Locate an open media slot on the host MS20 or MS30 basic switch module.
Slide the MM20-M2M2M2M2SAHH smoothly along the guide rails until the backplane connector locks into place.
Mechanical Fastening: Hand-tighten the top and bottom captive thumbscrews on the faceplate to secure the module chassis to the switch rack.
Fiber Optics Connection:
Remove dust caps from the SC optical jacks.
Connect duplex SC fiber cables, ensuring Tx (Transmit) on the switch connects to Rx (Receive) on the remote end-device.
Hot-Swap Operation: The module can be safely inserted or replaced while the host switch is powered on without disrupting existing backplane communications on other slots.
Fault Diagnosis
| Symptom / LED | Possible Cause | Corrective Action |
| Link LED Off | Transmit/Receive fibers swapped or no optical power | Reverse Tx/Rx fiber pair; check remote device power; inspect fiber line continuity with an optical power meter. |
| Power LED Off | Module not fully seated in switch backplane | Loosen thumbscrews, unseat module slightly, re-insert firmly, and re-tighten captive screws. |
| Yellow / Blinking LED | High frame error rate / optical attenuation | Clean SC fiber connectors using an optical lint-free cleaning pen; check fiber bend radius limits. |
| Intermittent Signal Drop | Dirty SC optical interface | Blow compressed air into optical receptacles and clean fiber patch cord ferrule tips with optical grade alcohol/swabs. |
Storage Conditions
Temperature Range: $-40^\circ\text{C}$ to $+70^\circ\text{C}$ in original antistatic packaging.
Atmospheric Protection: Store in a dry, clean indoor location.
Dust Prevention: Keep protective dust caps firmly inserted over all 4 SC optical receptacles to prevent dust contamination on the internal optical lenses.
Humidity: Maximum 95% relative humidity (non-condensing).
Related Models of the Same Series
The Hirschmann MICE MM20/MM30 series provides customizable options across copper, multimode SC/ST fiber, single-mode fiber, and SFP interfaces:
| Model Part Number | Media / Port Configuration | Temperature & Protection Tier |
| MM20-M2M2M2M2SAHH | 4 x Multimode SC Fiber (100Base-FX) | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-M2M2M2M2EBH | 4 x Multimode SC Fiber (100Base-FX) | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coated |
| MM20-T1T1T1T1SAHH | 4 x 10/100Base-TX (RJ45 Copper) | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-T1T1T1T1EBH | 4 x 10/100Base-TX (RJ45 Copper) | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coated |
| MM20-Z6Z6SAHH | 4 x Fast Ethernet SFP Slots | Standard Temp SFP Module |
| MM20-Z6Z6EBH | 4 x Fast Ethernet SFP Slots | Extended Temp SFP Module + Conformal Coated |
| MM20-M4M4T1T1 | 2 x Multimode SC + 2 x RJ45 | Hybrid Fiber/Copper Module |